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Motor output is more variable during eccentric compared with concentric contractions.

Evangelos A Christou1, Les G Carlton

  • 1Department of Kinesiology, University of Illinois at Urbana-Champaign, USA. echristo@colorado.edu

Medicine and Science in Sports and Exercise
|November 20, 2002
PubMed
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Young adults exhibit different motor output control for eccentric versus concentric knee-extension contractions. Eccentric contractions showed shorter time to peak force but greater variability in force and timing.

Area of Science:

  • Biomechanics
  • Motor Control
  • Human Physiology

Background:

  • Understanding the neural control of muscle contractions is crucial for rehabilitation and sports performance.
  • Differentiating between concentric and eccentric muscle actions provides insight into neuromuscular adaptations.

Purpose of the Study:

  • To investigate the force control capabilities of young, healthy individuals during discrete knee-extension contractions.
  • To compare motor output characteristics between concentric and eccentric contractions.

Main Methods:

  • 10 healthy young adults performed maximal and submaximal knee-extension tasks using an isokinetic dynamometer.
  • Submaximal tasks involved matching a target force-time profile with a 200 ms time to peak force.

Related Experiment Videos

Main Results:

  • Peak force production was comparable between concentric and eccentric contractions.
  • Time to peak force was significantly shorter for eccentric contractions and independent of target force.
  • Eccentric contractions demonstrated greater variability in peak force and normalized time to peak force.

Conclusions:

  • Motor output control differs between eccentric and concentric knee-extension contractions in young adults.
  • Eccentric contractions are characterized by faster force generation but less precise control compared to concentric contractions.